Two issues that the open world messes the Burnout franchise up a bit:
90 degree turns. I realized earlier today that this was a frequent problem for me. I don't think previous burnouts featured 90 degree turns. This is pretty frustrating to deal with, especially when flying up a hill. it kills all the momentum because you practically have to hit the brakes instead of drifting (unless you can hit a drift perfect enough that you miss all the cars around the corner that you don't know are there) and that not really that great for a burnout game. they keep 90 degree turns to a minimum often, but its still an issue I'm not too accostomed to.
You can "cheat" at Road rage. Previous incarnations made sure you kept driving in a linear direction on the map, and they gave you the inclination to do it fast. Now, if I make it to the appropriate road (such as the southern bridge with rail road over it and the 3 medians used for jumps) I can take my leisure time love tapping cars into walls (given i'm driving an aggression car). Kind of takes the fun out of it, but it's necessary when the Takedown scores get way too high (do they have a cap or do they escalate forever?). This takes some fun out of it, and given the risky nature of Class A or higher, with pedestrians driving across medians to get you, it's almost necessary to "cheat" this way.
Those are just two very un-burnout things i noticed that kind of bother me.